旋转木马
程序员文章站
2022-05-27 15:16:43
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旋转木马
<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title>旋转木马轮播图</title>
<style type="text/css">
@charset "UTF-8";
/*初始化 reset*/
blockquote,body,button,dd,dl,dt,fieldset,form,h1,h2,h3,h4,h5,h6,hr,input,legend,li,ol,p,pre,td,textarea,th,ul{margin:0;padding:0}
body,button,input,select,textarea{font:12px/1.5 "Microsoft YaHei", "微软雅黑", SimSun, "宋体", sans-serif;color: #666;}
ol,ul{list-style:none}
a{text-decoration:none}
fieldset,img{border:0;vertical-align:top;}
a,input,button,select,textarea{outline:none;}
a,button{cursor:pointer;}
.wrap{
width:1200px;
margin:100px auto;
}
.slide {
height:500px;
position: relative;
}
.slide li{
position: absolute;
left:200px;
top:0;
}
.slide li img{
width:100%;
}
.arrow{
opacity: 0;
}
.prev,.next{
width:76px;
height:112px;
position: absolute;
top:50%;
margin-top:-56px;
background: url(../images/prev.png) no-repeat;
z-index: 99;
}
.next{
right:0;
background-image: url(../images/next.png);
}
</style>
<script>
function getAttrValue(element,attr) {
return element.currentStyle?element.currentStyle[attr] : window.getComputedStyle(element,null)[attr]||0;
}
/*
* element----要移动的元素
* target----移动的目标
* 初级版本
* */
/*
* 终极版本的动画函数---有bug
*
* */
function animate(element,json,fn) {
clearInterval(element.timeId);
element.timeId=setInterval(function () {
var flag=true;//假设都达到了目标
for(var attr in json){
if(attr=="opacity"){//判断属性是不是opacity
var current= getAttrValue(element,attr)*100;
//每次移动多少步
var target=json[attr]*100;//直接赋值给一个变量,后面的代码都不用改
var step=(target-current)/10;//(目标-当前)/10
step=step>0?Math.ceil(step):Math.floor(step);
current=current+step;
element.style[attr]=current/100;
}else if(attr=="zIndex"){//判断属性是不是zIndex
element.style[attr]=json[attr];
}else{//普通的属性
//获取当前的位置----getAttrValue(element,attr)获取的是字符串类型
var current= parseInt(getAttrValue(element,attr))||0;
//每次移动多少步
var target=json[attr];//直接赋值给一个变量,后面的代码都不用改
var step=(target-current)/10;//(目标-当前)/10
step=step>0?Math.ceil(step):Math.floor(step);
current=current+step;
element.style[attr]=current+"px";
}
if(current!=target){
flag=false;//如果没到目标结果就为false
}
}
if(flag){//结果为true
clearInterval(element.timeId);
if(fn){//如果用户传入了回调的函数
fn(); //就直接的调用,
}
}
console.log("target:"+target+"current:"+current+"step:"+step);
},10);
}
var config = [
{
width: 400,
top: 20,
left: 50,
opacity: 0.2,
zIndex: 2
},//0
{
width: 600,
top: 70,
left: 0,
opacity: 0.8,
zIndex: 3
},//1
{
width: 800,
top: 100,
left: 200,
opacity: 1,
zIndex: 4
},//2
{
width: 600,
top: 70,
left: 600,
opacity: 0.8,
zIndex: 3
},//3
{
width: 400,
top: 20,
left: 750,
opacity: 0.2,
zIndex: 2
}//4
];
//页面加载的事件
window.onload = function () {
var flag=true;//假设所有的动画执行完毕了---锁====================================================
var list = document.getElementById("slide").getElementsByTagName("li");
//1---图片散开
function assign() {
for (var i = 0; i < list.length; i++) {
//设置每个li,都要把宽,层级,透明度,left,top到达指定的目标位置
animate(list[i], config[i],function () {
flag=true;//===============================================
});
}
}
assign();
//右边按钮
document.getElementById("arrRight").onclick = function () {
if(flag){//==========================================================
flag=false;
config.push(config.shift());
assign();//重新分配
}
};
//左边按钮
document.getElementById("arrLeft").onclick = function () {
if(flag){//==================================================
flag=false;
config.unshift(config.pop());
assign();
}
};
//鼠标进入,左右焦点的div显示
document.getElementById("slide").onmouseover = function () {
animate(document.getElementById("arrow"), {"opacity": 1});
};
//鼠标离开,左右焦点的div隐藏
document.getElementById("slide").onmouseout = function () {
animate(document.getElementById("arrow"), {"opacity": 0});
};
};
</script>
</head>
<body>
<div class="wrap" id="wrap">
<div class="slide" id="slide">
<ul>
<li><a href="#"><img src="images/slidepic1.jpg" alt=""/></a></li>
<li><a href="#"><img src="images/slidepic2.jpg" alt=""/></a></li>
<li><a href="#"><img src="images/slidepic3.jpg" alt=""/></a></li>
<li><a href="#"><img src="images/slidepic4.jpg" alt=""/></a></li>
<li><a href="#"><img src="images/slidepic5.jpg" alt=""/></a></li>
</ul>
<div class="arrow" id="arrow">
<a href="javascript:;" class="prev" id="arrLeft"></a>
<a href="javascript:;" class="next" id="arrRight"></a>
</div>
</div>
</div>
</body>
</html>
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